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  1. #include <iostream>
  2. #include <functional>
  3. #include <utility>
  4. #include <memory>
  5. #include <map>
  6.  
  7.  
  8. std::size_t amount = 0;
  9.  
  10.  
  11. template<typename T>
  12. struct my_allocator : std::allocator<T> {
  13.  
  14.    template<typename U>
  15.    struct rebind {
  16.  
  17.       typedef my_allocator<U> other;
  18.    };
  19.  
  20.    typename std::allocator<T>::pointer allocate(std::size_t const n, std::allocator<void>::const_pointer const hint = 0) {
  21.       amount += n * sizeof (T);
  22.       return std::allocator<T>::allocate(n, hint);
  23.    }
  24. };
  25.  
  26.  
  27. int main() {
  28.    std::map<int, int, std::less<int>, my_allocator<std::pair<int const, int> > > map;
  29.  
  30.    for (std::size_t i = 0; i != 10000; ++i) {
  31.       map.insert(std::make_pair(i, i));
  32.    }   
  33.  
  34.    std::cout << amount << std::endl;
  35. }
Success #stdin #stdout 0s 3736KB
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stdin
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Standard input is empty
stdout
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240000
https://ideone.com/cA6p3Q
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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